The idle used to bounce around A LOT on my '88 D20 with the Z24I motor. I put new plugs, wires, cap, and rotor on it the other night and it doesn't bounce around nearly like it did, and it runs a lot smoother now too
What concerns me now is the RPM at which it idles. When the engine is cold it idles at almost 2,500 rpm then after it warms up it settles down to between 1,500 and 2k rpm.
All of my vacuum lines are connected but I've not checked the IAC valve yet.......that is my only guess. Is there something else that might be causing this?
